Solar Powered Warm Air Extractor Fan Ventilator Vent Our new ultra low profile aerodynamic extraction unit is ultra quiet, and extract 950cu.ft per hour Featuring a large efficient solar panel that does not need intense direct sunlight to operate. 200 mm Diameter, and ONLY 25 mm HIGH - ULTRA LOW PROFILE extrusion Simple to fit - Just cut a 82mm or larger hole (this is a common hole saw size, though you can go larger (not supplied), place the supplied waterproof rubber gasket over the hole, place the vent body into the hole and then tighten inside by hand with the large plastic nut.